Plunger for cutting-cylinders.



P. BROOKES.

PLUNGERFOR CUTTING CYLINDERS APPLICATION FILED APR. 7; I317:

Patented Nov. 6, 1917.

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UNITED STATES PATENT OFFICE.

PETER BROOKES, F KEARNEY, NEW JERSEY, ASSIGNOR TO NAIRN LINOLEUM COM-PANY, OF KEARNEY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Nov. 6, 1917.

Application filed April 7, 1917. Serial No. 160,443.

To all whom it may concern:

Be it known that 1, PETER BRooKEs, a citizen of the United States ofAmerica, and residing at Kearney, in the county of Hudson and State ofNew Jersey, have invented a certain new and useful Improvement inPlungers for Cutting-Cylinders, of which the following is aspecification.

My invention relates to plungers for cut ting cylinders, andparticularly for cutting cylinders of the type used in the manufactureof mosaic floor cloth, the object of my invention being to provide aplunger of improved construction which is not only more economicallymanufactured but also more.

expeditiously manipulated during the cleaning or repairing of thecylinder after use.

Referring to the accompanying drawings, Figure 1 1s a partial sectionthrough a cutting cylinder in which plungers embodyin my invention aremounted;

Fig. 2 is a side elevation of a plunger device detached from thecylinder;

Fig. 8 is a section therethrough; and Fig. 4 is a dropped perspective ofthe plunger spindle and cap plate detached.

The apparatus to which my invention particularly pertains is the cuttingcylinder of a machine for making inlaid linoleum of the general typeillustrated in the. patent to Walton No. 626,117. This cutting roll consists of a cylinder 10 the shell of which is pierced by numerousperforations 11 through which the plunger stems 12 pass into theinterior of the cylinder. Within the latter is arranged the pattern roll13., the surface of which is provided with a series of recesses 14,conforming to the pattern and into which the plunger stems 12 enter topermit the pattern tesserae to be retained by the cutting cylinder,whereas the plungers bearing upon the surface of the pattern roll areforced outward by the latter and throw out the material between thetesserae which it is desired to retain for the given pattern. In theseparticulars the apparatus is of well-known construction.

At its outer end each plunger 12 carries a head 15 which may conformgenerally to the shape of the tesserae cut by the knives 16 but havingsuflicient clearance to work freely in the space outlined by the knives.After the machine has been in operation some time, the sides of theknives and the head 15 of the plunger become gummed by cleaned. Theoperation is not only slow but .it also involves the danger of the screwbeing insecurely replaced, with the. attendant possibility of the headbecoming detached from the plunger and fouling the knives,

or in some other way. damaging or interfering with the proper operationof the apparatus.

The present invention affords an improved plunger construction whichfacilitates the cleaning operation as well as rendering the manufactureof the plunger itself more economical than has heretofore been the case.Each plunger 12 is carried by a bushing 17 which is driven into one ofthe perforations 11 in the cylinder shell and is wedged therein. Aninternal shoulder 18 is formed within the bore of the bushing in anysuitable. way, for instance, by means of a screw plug 19 threading intothe tapped outer end of the bushing and provided with a central hole 20through which the plunger passes. A collar 21 is formed on or secured tothe plunger, and works within the inner end of the bushing. Between theshoulder 18 and the collar 21 is confined a light coil spring 22 whichserves to retract the plunger after it has been pushed out by thepattern roll to extrude the material retained between the cuttingknives. At its outer end the plunger 12 is bored or otherwise hollowedat 23 to receive the stem 24k of the plunger head 15. This stem is splitat its inner end 25 and the. split end slightly spread to afford afriction grip within the bore 23 of the plunger. The stem 24 may beintegral with the head 15, or be secured thereto in any desired fashion.A hole 26 is formed in the plunger head and tapped to receive a threadedwire with handle loop, by which the operator may withdraw the head 15,with its split stem 21, from the hollow plunger 12, when it is desiredto clean the knives and the plunger head. The reassembling of theplunger head and plunger is expeditiously accomplished by merely pushingthe split end 25 of the stem into the bore. 23 in the outer end of theplunger.

The cleaning operation is thus greatly eX- pedited. Moreover, thepresent construction eliminates the cost of tapping the plunger toreceive the usual screw forretaining the plunger head; also the cost ofthe screw. Furthermore, it eliminates the necessity of forming a. flangeor pin in the plunger and its corresponding guide way in the bushing toprei'ent the rotation of the plunger in the latter when the usualsecuring screw for the head is screwed in. And this elimination of thepin and slot engagement between the plunger and bushing eliminates apossible danger to the proper functioning of the plunger and insuresmore perfect operation of the latter.

Modifications in detail will readily occur to those skilled in the artwithout departing from what I claim is my invention.

1 claim 1. For use in a cutting cylinder of the type described a plungerhaving an independent head and a stem rigid therewith, and means forfrictionally engaging the stem with the plunger.

2. In a. construction such as specified. in claim 1, in which theplunger has an end here and the stem is slot-ted to afford a fricti onalgrip within said bore.

3. For use in a cutting cylinder of the type described, a bushingadapted to be secured in the cylinder shell, a plunger radially slidablein said bushing and a head for said plunger, said head having a stern enaging said plunger with a readily detachable connection.

t. For use in a cutting cylinder of the type described, a bushingadapted to be secured in the cylinder shell, a plunger radially slidablein said bushing and a head for said plunger, said head having a stemengaged with and disengaged from said plunger by a substantiallystraight push or pull, for the. purpose described.

In testimony whereof I have signed my name to this specification.

PETER BROOKES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

